Multiple-turning lathe.



J'. MCGREGOR I A. SNEDDON.

MULTIPLE TURNING LATHEI APPLICATION FILED DEC. I2. I9I6.

3 SHEETS-SHEET lll l 9? Patented Apr. 30, 1918.

J. MCGREGOR & A. SNEDDON. MULTIPLE TURNING LATHE. APPucATmN F'ILEDDEc.12, 191s.

3 SHEETS-SHEET 2.

l. MCGREGUR & A. SNEDDON.

MULTIPLE TURNING LATHE. APPLICATION HLED'DEC. 1.2, 1916.

s SHEETS-SHEET 3. "MM,

Patented Apr. 30, 1918.

As shown in Fig. 2, the tool-holder R is provided with ten radiallydisposed arms, each provided with a slide-rest r and a revolving turret7" for carrying roughing and finishing tools and any other special toolswhich may ybe required in view ofthe nature of the work. The toolscarried by the tool holder are so disposed that the lineof cut of eachtool will be on the surface of an imaginary cylinder. y

In small machines the slide rests and turrets may be dispensed with,there being provided oppositely disposed roughing and finishing tools,the drive being reversed to bring the finishing tools into operation.

The tools are adjustable independently or simultaneouslyv from the backend of the tool-holder'bar N by means of a hand wheel S and pinions T, apinion T keyed to the hand wheel. boss serving to impartrotation toany's'elected pinion T or all the pinions T, it being understood thatmovement is suitably transmitted to the tools from the pinions T, forexample by means of spindles extending longitudinally of the bar, radialspindles'Q, bevel'gears l3 and worm gearing 4. Other means of ,acjustment may, however, be employed.

To impart to the tools the movements required in order to turn the workto the desired ferm, there are vemployed two formers U"'hav ingv planeVor shaped surfaces, such form/ers being bolted between the fast andloose 4heads of the lathe. F ig. 3 represents a former of the vshaperequired for turning ogival bodies.y Cast on the tool-holder areprojections V, one on each side of the lathe, each such proj ectionbeing fitted with a slide rest WV adjustable by means of a hand wheeland worm, ysuch adjustment permitting an angular movement of thetool-holder bar to give any' desired depth of cut to all the toolssimultaneously.` Fitted on each of the slide restsv W isa pair ofrollers or followers W, the rollers being arranged to track the formersU, so'tliat asthe tool-holder bar N is m'oyed axially it isautomatically angularly displaced so that the tool-holder and 'toolsbeing correspondingly moved the vwork is turned to the required form.

Inglie'u of being located between the fast and loose headsthe formersmight be arranged 'at thevback of the loose head, a crossheadliixed onthe end of the tool holder bar: N 'carrying'atits end rollers to engagethe OHIQYS f 'Thel desired feed is imparted tothe toolholder jbar, fromthe screw 5' and coperatingiiut, the screw being driven from one ofthelathe spindles through lthe intermediary of.l change-wheels, so' astov givefany desired rangeofspeed'changes,YM i v To effect quickretraction of the tools,

there is cut in the tool-holder bar N a rack meshed by a pinion X onwhich is keyed a hand-wheel Y.

That we claim is 1. In a lathe, in combination, a plurality of spindlesand a plurality of pairs of alined centers concentric with said spindlesand located on the surface of a common imaginary cylinder, means forsimultaneously rotating said spindles9 a tool-holder concentric With theaxis of said imaginary cylinder and confined to limited angularmovement7 a former determining the angular movement of the tool-holder,and normally stationary tools carried by said tool-holder and sodisposed that the line of cut of each tool lies on the surface of saidimaginary cylinder.

' 2. In a lathe, in combination, a plurality of driving spindlessimultaneousl f rotatable around axes on the surface of a commonimaginary cylinder, means for simultaneously rotating said spindles, atool-holder arranged concentric with the axis of said imaginary cylinderand provided with arms said tool-holder being confined kto limitedangular movement, pairs of oppositely directed normally stationary toolscarried by said arms, and means for shifting said toolholder angularlyin either direction to bring into operation simultaneously the toolsdisposed in that direction.

3.1n a lathe, in combination,- aplural number of drivers simultaneouslyrotatable around axes located on 'the surface ofa co1nmon imaginarycylinder, a longitudinally movable tool-holder confined to limitedangular movement, normally stationary tools carried by said tool-holderand so disposed that the line of cut of each tool lies on the surface ofsaid imaginary cylinder, a former for Ldetermining the angular movementof said tool-holder, anda follower carried by said tool-holder andengaging said former.

4. In a lathe, in combination, a plural number of pairs of alinedcenters located on thesurface of a der, a tool-holder confined tolimited angular movement, a former determining the angularl movement ofsaid tool-holder, nor-k mally stationary tools carried by saidtoolholder and sodisposed that the line of cut of each tool lies on thesurface of said imaginary cylinder, means for feeding the toolsinunison, -and means for adjusting the tools individuallyv orsimultaneously.

5. In a lathe, in combination, a plural number of pairs of alinedcenters located at the surface of a common imaginary cylinder, a hollowdriving shaft, an axially movable tool holder-bar .accommodated in saidholy low driving shaft 1and confined tol limited angular movementj aformer `determining common imaginary cylin-` the angular movement ofsald har,

a toolnames to this speccaton in thepresence of holder earned by saidtoolfholder har, and `two subscribing Witnesses.

normally stationary tools carried by said tool-holder and so disposedthat the line of cut of each tool lies on the surface of said imaginarycylinder.

In testimony whereof We halve signed our @om mf thm patent may beobtmlnedlfor Y JOHN MGGREGOR.

ANDREW SNEDDON. Witnesses:

WM. TURNBULL. THOMAS FooRD.

ve cents each, by addressing the Gommissioner of Patente,

mshinmon, 1D.

